How did forming trusts help John D.
Rockefeller?

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Explanation:

A combination of firms or corporations formed by a legal agreement designed to reduce competition. The effect of trusts was to produce monopolies within certain industries or areas. John D. Rockefeller's company, formed in 1870, which came to symbolize the trusts and monopolies of the Gilded Age.

answer: they arrived in new york.

in the 1950s, country music came into its own before rock-n-roll took off in the 60s while jazz and classical music continued to innovate